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Materials 2019, 12(3), 503; https://doi.org/10.3390/ma12030503

Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI)

1
Centre of Excellence for Research in Engineering Materials, King Saud University, Riyadh 11421, Saudi Arabia
2
Department of Metallurgical and Materials Engineering, Jadavpur University, Kolkata 700032, India
3
Department. of Architectural Engineering, Hanyang University, 15588 Ansan, Korea
4
Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada
5
Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
6
Department of Metallurgy and Materials Engineering, Indian Institute of Engineering Science and Technology, Shibpur 711103, India
*
Authors to whom correspondence should be addressed.
Received: 16 January 2019 / Revised: 1 February 2019 / Accepted: 2 February 2019 / Published: 6 February 2019
(This article belongs to the Special Issue Recent Advances in Corrosion Science)
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Abstract

The aim of this investigation was to assess the corrosion behavior of gray cast iron (GCI) alloyed with copper. Alloyed GCI specimens were austempered isothermally at varying temperatures. After austenitizing at 927 °C, the samples were austempered at different temperatures ranging from 260 to 385 °C with an interval of 25 °C for 60 minutes. As a result, these samples developed an ausferrite matrix with different percentages of austenite. The resulting microstructures were evaluated and characterized by optical microscope (OM), scanning electron microscope (SEM), and X-ray diffraction (XRD). The corrosion characteristics were determined using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) of these samples. These tests were carried out in a medium of 0.5 M H2SO4 and 3.5% NaCl solution. It was observed from the potentiodynamic polarization results that with increasing austempering temperature, the corrosion rate decreased. All results of the EIS were in accordance with a constant phase element (CPE) model. It was found that with an increase in austempering temperature, the polarization resistance (Rp) increased. The austenite content was also found to influence the corrosion behavior of the austempered gray cast iron (AGCI). View Full-Text
Keywords: austempered gray cast iron; austempering temperature; microstructure; potentiodynamic polarization; electrochemical impedance spectroscopy austempered gray cast iron; austempering temperature; microstructure; potentiodynamic polarization; electrochemical impedance spectroscopy
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Seikh, A.H.; Sarkar, A.; Singh, J.K.; Mohammed, S.M.A.K.; Alharthi, N.; Ghosh, M. Corrosion Characteristics of Copper-Added Austempered Gray Cast Iron (AGCI). Materials 2019, 12, 503.

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